Which of the following is least ionic?

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Solution

Q.
Which of the following is least ionic [2024]

1 ${BaCl}_{2}$

2 $AgCl$

3 $KCI$

4 ${CoCl}_{2}$

Ans.
(2)

All chlorides are soluble in water except of ${Ag}^{+}, {Hg}_{2}^{2 +}, {Pb}^{2 +}, {Cu}^{+}, {SbO}^{+}, {BiO}^{+}$ and ${Hg}_{2} O^{+}$ . Thus AgCl is water insoluble whereas ${BaCl}_{2}, KCl$ and ${CoCl}_{2}$ are water soluble. As like dissolves like, this gives us an idea that AgCl is least ionic of all. ${Ag}^{+}$ has pseudo noble gas configuration [ $(n - 1) s^{2}, (n - 1) p^{6}, (n - 1) d^{10}$ type configuration]. Due to poor shielding of d and f electrons its $Z_{eff}$ is high so polarization power of ${Ag}^{+}$ is high. This induces significant covalent character in AgCl.

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